Bernina 730 Manual - Page 13

29

30

Fit.

5

tread

plate

downwards,

the

greater

the

speed

of

the

machine.

Practise

speed

control

several

times

without

thread-

ing

the

machine.

The

lamp

is

mounted

in

the

swivelled

head

cover

to

enable

an

even

distribution

of

light

over

the

entire

sewing

area,

completely

free

from

any

glare.

It

is

switched

on

and

off

by

pressing

the

li

ght

but-

ton

6.

The

bulb

can

be

changed

as

is

usual

with

the

current

lamps.

Turn

it

to

the

left

to

remove,

and

to

the

right

to

insert.

Care

of

the

motor

a)

Lubrification

The

motor

has

friction

bearings,

by

means

of

which

a

nearly

silent

running

can

be

obtained.

The

bearings

are

automatically

lubricated,

so

that

they

need

no

service

at

all.

b)

Carbon

brushes

From

time

to

time

the

length

of

the

carbon

brushes

should

be

controlled.

To

this

intent

first

the

motor

cover

must

ne

screwed

off

(Remove

the

mains

plug!).

Now

the

upper

carbon

brush

support

becomes

visible.

After

having

screwed

off the

cap,

the

collector

car-

bon

can

be

drawn

out.

The

collector

carbon

opposite

to

the

carbon

brush

is

accessible

through

the

bore-

hole

at

the

underside

of

the

bed

plate.

Here

too

the

carbon

holder

cap

is

screwed

out

and

the

carbon

brush

removed.

If

these

carbon

brushes

are

not

re-

newed

in

due

time

—

with

a

minimum

length

of

3

millimeters-,

they

will

damage

the

collector

and

soon

the

motor

can

no

more

be

used.

When

re-inserting

the

carbon

brushes

please

take

care

that

the

ground

rounding

which

must

match

with

the

rounding

of

the

collector

is

not

introduced

wrongly.

11

Bernina 730 Manual - Page 13

controlled.

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